The Scammell Pioneer was a British 6x4 tractor used in the Second World War as an artillery tractor, recovery vehicle and tank transporter. Pioneers purchased by the British Army were equipped with a 102 bhp Gardner 6 cylinder diesel engine.

The Pioneer R100 heavy artillery tractor was introduced in 1935 and used throughout WWII to tow medium and heavy artillery guns. 980 Pioneer R100 heavy artillery tractors were delivered by the end of the war.